JPH0615512A - Drill and formation of cutting blade of drill - Google Patents

Drill and formation of cutting blade of drill

Info

Publication number
JPH0615512A
JPH0615512A JP4176986A JP17698692A JPH0615512A JP H0615512 A JPH0615512 A JP H0615512A JP 4176986 A JP4176986 A JP 4176986A JP 17698692 A JP17698692 A JP 17698692A JP H0615512 A JPH0615512 A JP H0615512A
Authority
JP
Japan
Prior art keywords
drill
cutting edge
outer peripheral
margin portion
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4176986A
Other languages
Japanese (ja)
Inventor
Toshiaki Hosoi
俊明 細井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP4176986A priority Critical patent/JPH0615512A/en
Publication of JPH0615512A publication Critical patent/JPH0615512A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To drill a hole which is excellent in roundness and needs no reaming after drilling without causing run-out of its center during drilling and without making flaws on the inwall of the drilled hole. CONSTITUTION:On a drill 1 formed with a chip discharge groove 11 and margin parts 33 on a shank 10 and cutting blades 31 on its point part, between the outer peripheral end of the cutting blades 31 and the margin parts 33, inclined surfaces 4 gradually increasing distance from the central axis of the drill 1 are formed, and a rotational locus formed by the margin parts 33 is formed larger in diameter by 5/1000-200/1000mm than a rotational locus formed by the outer peripheral end of the cutting blades 31, and formation of its cutting blades thereby is obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、先端部に切刃が形成
され、シャンクに切屑排出溝が形成されたドリルおよび
ドリルの切刃形成方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill having a cutting edge formed at its tip and a chip discharging groove formed on a shank, and a method for forming a cutting edge of the drill.

【0002】[0002]

【従来の技術】金属材料の穴明け用のドリルとして、先
端部に切刃が形成され、シャンクに切屑排出溝およびマ
ージン部が形成されたドリルが広く使用されている。そ
して従来の構造では、切刃の外周端がドリルの最大直径
を形成するように切刃が構成され、この切刃の外周端と
マージン部とが同一直径の回転軌跡を形成するようにし
ている。
2. Description of the Related Art As a drill for drilling a metal material, a drill having a cutting edge formed at its tip and a chip discharge groove and a margin formed on a shank is widely used. Then, in the conventional structure, the cutting edge is configured so that the outer peripheral end of the cutting edge forms the maximum diameter of the drill, and the outer peripheral end of the cutting edge and the margin portion form a rotation trajectory of the same diameter. .

【0003】[0003]

【発明が解決しようとする課題】上記構成では、穴明け
加工中に芯振れが生じることが避けられず、この芯振れ
に応じて加工孔も真円度が崩れるとともに、加工孔の内
壁に切刃外周端による傷が付くことが避けられなかっ
た。したがって、従来のドリルによる穴明け加工の後に
は、真円度の調整と内壁面の平滑化のためにリーマ仕上
げが必要となっていた。
With the above-described structure, it is inevitable that center runout will occur during drilling, and the roundness of the machined hole will be destroyed due to this runout, and the inner wall of the machined hole will be cut. It was unavoidable that the edge of the blade was scratched. Therefore, after the conventional drilling process, reaming is necessary for adjusting the roundness and smoothing the inner wall surface.

【0004】この発明は、このような従来の欠点を解消
するためになされたものであり、加工中に芯振れが生じ
ることがなく、このため加工孔の内壁に傷が付くことが
なく、加工孔の真円度も優れ、このためリーマ仕上げも
必要ない正確な孔加工ができるドリルおよびドリルの切
刃形成方法を提供することを目的とするものである。
The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, in which no center runout occurs during processing, and therefore the inner wall of the processed hole is not scratched. It is an object of the present invention to provide a drill and a method for forming a cutting edge of the drill, which are excellent in roundness of a hole and therefore do not require reaming to perform accurate hole processing.

【0005】[0005]

【課題を解決するための手段】この発明のドリルは、シ
ャンクに切屑排出溝およびマージン部が形成され、先端
部に切刃が形成されたドリルにおいて、切刃の外周端に
よって形成される回転軌跡よりマージン部によって形成
される回転軌跡の方が5/1000〜20/1000m
m大径に形成されているものである。
A drill of the present invention is a drill having a chip discharge groove and a margin portion formed on a shank and a cutting blade formed at a tip end thereof, and a rotation locus formed by an outer peripheral end of the cutting blade. The rotation locus formed by the margin is 5/1000 to 20 / 1000m
It has a large diameter.

【0006】上記切刃の外周端からマージン部までの間
に、ドリルの中心軸からの距離が徐々に増大する傾斜面
を形成することが好ましい。
[0006] It is preferable to form an inclined surface between the outer peripheral end of the cutting edge and the margin portion, the distance gradually increasing from the center axis of the drill.

【0007】またこの発明のドリルの切刃形成方法は、
シャンクに切屑排出溝およびマージン部が形成され、先
端部に切刃が外周端まで形成されたドリルにおいて、切
刃とマージン部との交差部を研削することによって、切
刃の外周端によって形成される回転軌跡よりマージン部
によって形成される回転軌跡の方が5/1000〜20
0/1000mm大径に形成されるように切刃の外周端
からマージン部までの間にドリルの中心軸からの距離が
徐々に増大する傾斜面を形成するようにしたものであ
る。
The method for forming a cutting edge of a drill according to the present invention is
In a drill in which a chip discharge groove and a margin portion are formed on a shank, and a cutting edge is formed at the tip to the outer peripheral edge, by forming the outer edge of the cutting edge by grinding the intersection of the cutting edge and the margin portion. The rotation locus formed by the margin part is 5/1000 to 20
An inclined surface whose distance from the center axis of the drill gradually increases is formed between the outer peripheral edge of the cutting edge and the margin portion so that the diameter is 0/1000 mm.

【0008】[0008]

【作用】上記構成では、切刃によって所定の直径の孔加
工が行なわれ、切刃は加工孔の内壁よりわずかに小径に
形成されて加工孔の内壁面には常にマージン部が接触し
ているために、これがガイドの作用を果たして芯振れが
防止されることになる。さらに切刃の外周端で形成した
加工孔の内壁は、外周端に続く傾斜面およびマージン部
によって外方に押しつけられ、これによって加工孔の内
壁は平滑な面に仕上げられる。このため加工孔は真円度
が優れ、しかも加工孔の内壁は非常に平滑に仕上げら
れ、リーマによる仕上げ加工は必要ない加工孔が形成さ
れる。
In the above construction, the cutting edge is used to form a hole having a predetermined diameter, and the cutting edge is formed to have a diameter slightly smaller than the inner wall of the processing hole so that the margin portion is always in contact with the inner wall surface of the processing hole. Therefore, this acts as a guide and core runout is prevented. Further, the inner wall of the machined hole formed at the outer peripheral edge of the cutting edge is pressed outward by the inclined surface and the margin portion following the outer peripheral edge, whereby the inner wall of the machined hole is finished into a smooth surface. Therefore, the machined hole has excellent roundness, and the inner wall of the machined hole is finished very smooth, so that the machined hole does not need to be finished by a reamer.

【0009】[0009]

【実施例】図1〜図3において、ドリル1は一般工具鋼
からなるシャンク10の先端部に一対の超硬合金製のチ
ップ3が取付けられてなり、このチップ3にはそれぞれ
切刃31が形成されている。この切刃31は中心部が底
面視で回転方向に凸なる曲線に形成され、それより外周
側はほぼ直線に形成され、この切刃31がドリルの中心
点Oに対して互いに点対称に配置されている。またシャ
ンク10には螺旋状に切屑排出溝11が形成され、この
切刃排出溝11の先端部が切刃31のすくいすくい面3
5に連続している。上記チップ3の先端面は切刃31の
逃げ面36を形成し、チップ3の外周面はドリル1の最
外周面を形成し、この外周面によってドリル1のマージ
ン部33が形成されている。
1 to 3, a drill 1 comprises a shank 10 made of general tool steel, and a pair of cemented carbide tips 3 attached to the tip of the shank 10. Each of the tips 3 has a cutting edge 31. Has been formed. The cutting edge 31 has a center portion formed in a curved line which is convex in the rotational direction in a bottom view, and is formed substantially straight on the outer peripheral side thereof, and the cutting edges 31 are arranged symmetrically with respect to the center point O of the drill. Has been done. Further, a chip discharge groove 11 is formed in a spiral shape on the shank 10, and the tip end portion of the cutting edge discharge groove 11 is the rake face 3 of the cutting blade 31.
5 consecutive times. The tip surface of the tip 3 forms the flank 36 of the cutting edge 31, the outer peripheral surface of the tip 3 forms the outermost peripheral surface of the drill 1, and the marginal portion 33 of the drill 1 is formed by this outer peripheral surface.

【0010】上記切刃31の外周端34からマージン部
33までの間には、ドリル1の中心軸からの距離が徐々
に増大する傾斜面4が形成され、切刃31の外周端34
によって形成される回転軌跡よりマージン部33によっ
て形成される回転軌跡の方が所定量dだけ大径に形成さ
れている。この所定量dは5/1000〜200/10
00mm、好ましくは10/1000〜100/100
0mm、さらに好ましくは20/1000〜40/10
00mmに設定する。この値が、5/1000mmより
小さいとドリルの芯振れが生じたり、加工孔内壁に傷が
付いたりする問題が発生し、また20/1000mmよ
り大きくなるとマージン部が加工孔内壁に強く圧着され
て孔加工の際のドリルの回転抵抗が大きくなって好まし
くない。
An inclined surface 4 is formed between the outer peripheral end 34 of the cutting edge 31 and the margin portion 33 so that the distance from the central axis of the drill 1 gradually increases, and the outer peripheral edge 34 of the cutting edge 31 is formed.
The rotation locus formed by the margin portion 33 is formed to have a larger diameter by a predetermined amount d than the rotation locus formed by. This predetermined amount d is 5/1000 to 200/10
00 mm, preferably 10/1000 to 100/100
0 mm, more preferably 20/1000 to 40/10
Set to 00 mm. If this value is smaller than 5/1000 mm, there will be problems such as runout of the drill core and scratches on the inner wall of the processed hole. If it is larger than 20/1000 mm, the margin will be strongly pressed against the inner wall of the processed hole. The rotation resistance of the drill during drilling is unfavorable.

【0011】なお、上記マージン部33の部分の直径
は、シャンク10の直径より40/1000〜300/
1000mm大きくなるように形成すればよい。
The diameter of the margin portion 33 is 40/1000 to 300 / than the diameter of the shank 10.
It may be formed to be 1000 mm larger.

【0012】上記切刃形状を形成させるには、まずチッ
プ3に傾斜面4が形成されていない状態で、シャンク1
0にろう付けなどの手段によって取付けて切刃31を公
知の方法で形成させ、これによって切刃31の外周端が
チップ3の外周端に達するようにする。その後、図1仮
想線で示す三角形の角部5をグラインダで研削して、半
径t(5/2000〜200/2000mm)だけ切刃
31の直径が小さくなるようにする。この傾斜面4は平
面でもよく、あるいは軸方向または周方向に湾曲した曲
面でもよい。
In order to form the cutting edge shape, first, the shank 1 is formed in a state where the inclined surface 4 is not formed on the tip 3.
The cutting edge 31 is attached by a means such as brazing to form the cutting edge 31 by a known method, so that the outer peripheral edge of the cutting edge 31 reaches the outer peripheral edge of the tip 3. Then, the corner portion 5 of the triangle shown by the imaginary line in FIG. 1 is ground by a grinder so that the diameter of the cutting edge 31 is reduced by a radius t (5/2000 to 200/2000 mm). The inclined surface 4 may be a flat surface or a curved surface curved in the axial direction or the circumferential direction.

【0013】図4はこの発明の別の実施例を示し、高速
度鋼や超硬合金等からなるシャンク12の先端部に一対
の切刃31が一体に形成されて互いに点対称に配置さ
れ、またシャンク12の切屑排出溝11の縁部に沿って
マージン部50が形成されている。そして、切刃31の
外周端34からマージン部53までの間には、上記実施
例と同様にドリル1の中心軸からの距離が徐々に増大す
る傾斜面4が形成され、切刃31の外周端34によって
形成される回転軌跡よりマージン部53によって形成さ
れる回転軌跡の方が5/1000〜20/1000mm
大径に形成されている。なお、上記同様に、切刃外周端
34によって形成される回転軌跡の直径はシャンク11
の直径より大きくなるように形成されている。
FIG. 4 shows another embodiment of the present invention, in which a pair of cutting blades 31 are integrally formed at the tip of the shank 12 made of high-speed steel, cemented carbide or the like and are arranged point-symmetrically to each other. A margin portion 50 is formed along the edge of the chip discharge groove 11 of the shank 12. Then, between the outer peripheral end 34 of the cutting edge 31 and the margin portion 53, the inclined surface 4 in which the distance from the central axis of the drill 1 gradually increases is formed as in the above embodiment, and the outer periphery of the cutting edge 31 is formed. The rotation locus formed by the margin portion 53 is 5/1000 to 20/1000 mm more than the rotation locus formed by the end 34.
It has a large diameter. In addition, similarly to the above, the diameter of the rotation trajectory formed by the outer peripheral edge 34 of the cutting edge is the shank 11
Is formed to be larger than the diameter of the.

【0014】上記実施例では、切刃31の形状は一例の
みを示したが、この発明では切刃外周端部分の構造に特
徴があるのであり、したがって切刃自体の形状はこれに
限らず種々のものが採用可能である。また上記第1の実
施例では、マージン部は切屑排出溝11に沿っては形成
されてなく、チップ3の外周面にのみ形成されている
が、この発明にいうシャンクに切屑排出溝およびマージ
ン部が形成されているとは、このような態様も含む概念
である。
In the above embodiment, the shape of the cutting edge 31 is shown only as an example, but the present invention is characterized by the structure of the outer peripheral edge portion of the cutting edge, and therefore the shape of the cutting edge itself is not limited to this. The thing of can be adopted. Further, in the first embodiment, the margin portion is not formed along the chip discharge groove 11, but is formed only on the outer peripheral surface of the chip 3, but the shank according to the present invention includes the chip discharge groove and the margin portion. Is formed is a concept including such an aspect.

【0015】上記各構成のドリル10によって孔明け加
工を行なうと、切刃31で所定の直径の孔加工が行なわ
れる。そしてその加工孔は真円度が優れ、しかも加工孔
の内壁は非常に平滑に仕上げられ、リーマによる仕上げ
加工は必要ない加工孔が形成される。加工孔内壁の平滑
度は、切刃31の外周端34によって形成される回転軌
跡よりマージン部33によって形成される回転軌跡の方
を30/1000mm大径に形成した場合は3s程度と
なり、従来のドリルによる場合は100s程度であるか
ら、平滑度は非常に優れているといえる。
When drilling is performed by the drill 10 having each of the above-described configurations, the cutting blade 31 drills a hole having a predetermined diameter. The machined hole has excellent roundness, and the inner wall of the machined hole is finished very smooth, so that the machined hole does not need to be finished by a reamer. The smoothness of the inner wall of the machined hole is about 3 s when the rotation locus formed by the margin portion 33 is formed to have a diameter of 30/1000 mm larger than the rotation locus formed by the outer peripheral end 34 of the cutting edge 31, which is about 3 s. It can be said that the smoothness is very excellent because it is about 100 s when using a drill.

【0016】このような精度の加工が行なわれるのは、
つぎのような理由によるものと思われる。すなわち、従
来のドリルでは加工中の芯振れに応じて切刃の外周端が
加工孔の内壁を削り込んで孔を広げるとともに、内壁に
周方向の傷をつけることになる。これに対し、上記実施
例の構造では、切刃31は加工孔の内壁よりわずかに小
径に形成されて内壁面には常にマージン部33,50が
接触しているために、これがガイドの作用を果たして芯
振れが防止されることになる。芯振れが生じるためには
切刃外周端で加工孔を削り広げることが必要であり、切
刃外周端が加工孔内壁まで達していなければ加工孔の削
り広げができず、しかも加工孔の内壁面には常にマージ
ン部が接触しているために芯振れが生じるのも防止され
ることになる。
The processing with such accuracy is performed
This is probably due to the following reasons. That is, in the conventional drill, the outer peripheral end of the cutting blade cuts the inner wall of the processing hole to widen the hole in accordance with the runout during machining, and the inner wall is damaged in the circumferential direction. On the other hand, in the structure of the above-described embodiment, the cutting edge 31 is formed to have a diameter slightly smaller than the inner wall of the processing hole, and the margin portions 33 and 50 are always in contact with the inner wall surface. As a result, runout is prevented. In order for center runout to occur, it is necessary to cut and widen the machining hole at the outer peripheral edge of the cutting edge.If the outer peripheral edge of the cutting edge does not reach the inner wall of the machining hole, the machining hole cannot be widened and the inside of the machining hole cannot be expanded. Since the margin portion is always in contact with the wall surface, core runout is prevented from occurring.

【0017】さらに上記切刃外周端34で形成した加工
孔の内壁は、外周端34に続く傾斜面4およびマージン
部33,50によって外方に押しつけられ、これによっ
て平滑な面に仕上げられる。
Further, the inner wall of the machining hole formed at the outer peripheral edge 34 of the cutting edge is pressed outward by the inclined surface 4 and the margin portions 33 and 50 following the outer peripheral edge 34, whereby a smooth surface is finished.

【0018】[0018]

【発明の効果】以上説明したように、この発明によれば
切刃によって所定の直径の孔加工が行なわれ、切刃は加
工孔の内壁よりわずかに小径に形成されて内壁面には常
にマージン部が接触しているために、これがガイドの作
用を果たして芯振れが防止されることになる。さらに切
刃の外周端で形成した加工孔の内壁は、外周端に続く傾
斜面およびマージン部によって外方に押しつけられ、こ
れによって加工孔の内壁は平滑な面に仕上げられる。こ
のため加工孔は真円度が優れ、しかも加工孔の内壁は非
常に平滑に仕上げられ、リーマによる仕上げ加工は必要
ない加工孔が形成される。またこの発明の切刃形成方法
では、従来構造のドリルにおいて、切刃外周端をグライ
ンダで所定量研削するだけでよく、極めて簡単に加工す
ることができる。
As described above, according to the present invention, a hole having a predetermined diameter is machined by the cutting blade, the cutting blade is formed to have a diameter slightly smaller than the inner wall of the processing hole, and the inner wall surface is always provided with a margin. Since the parts are in contact with each other, this acts as a guide to prevent runout. Further, the inner wall of the machined hole formed at the outer peripheral edge of the cutting edge is pressed outward by the inclined surface and the margin portion following the outer peripheral edge, whereby the inner wall of the machined hole is finished into a smooth surface. Therefore, the machined hole has excellent roundness, and the inner wall of the machined hole is finished very smooth, so that the machined hole does not need to be finished by a reamer. Further, according to the cutting edge forming method of the present invention, in the drill having the conventional structure, the outer peripheral end of the cutting edge only needs to be grinded by the grinder by a predetermined amount, and the cutting can be performed very easily.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例を示すドリル先端部の正面図
である。
FIG. 1 is a front view of a drill tip portion showing an embodiment of the present invention.

【図2】図1の側面図である。FIG. 2 is a side view of FIG.

【図3】図1の底面図である。FIG. 3 is a bottom view of FIG.

【図4】この発明の別の実施例を示す側面図である。FIG. 4 is a side view showing another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 ドリル、 3 チップ 4 傾斜面 10,12 シャンク 11 切屑排出溝 33,50 マージン部 1 drill, 3 tip 4 inclined surface 10,12 shank 11 chip discharge groove 33,50 margin part

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 シャンクに切屑排出溝およびマージン部
が形成され、先端部に切刃が形成されたドリルにおい
て、切刃の外周端によって形成される回転軌跡よりマー
ジン部によって形成される回転軌跡の方が5/1000
〜200/1000mm大径に形成されていることを特
徴とするドリル。
1. In a drill having a chip discharge groove and a margin portion formed on a shank and a cutting blade formed at a tip portion, a rotation locus formed by the margin portion is larger than a rotation locus formed by an outer peripheral end of the cutting blade. 5/1000
A drill having a large diameter of up to 200/1000 mm.
【請求項2】 上記切刃の外周端からマージン部までの
間に、ドリルの中心軸からの距離が徐々に増大する傾斜
面が形成されていることを特徴とする請求項1記載のド
リル。
2. The drill according to claim 1, wherein an inclined surface whose distance from the center axis of the drill gradually increases is formed between the outer peripheral end of the cutting edge and the margin portion.
【請求項3】 シャンクに切屑排出溝およびマージン部
が形成され、先端部に切刃が外周端まで形成されたドリ
ルにおいて、切刃とマージン部との交差部を研削するこ
とによって、切刃の外周端によって形成される回転軌跡
よりマージン部によって形成される回転軌跡の方が5/
1000〜200/1000mm大径に形成されるよう
に切刃の外周端からマージン部までの間にドリルの中心
軸からの距離が徐々に増大する傾斜面を形成することを
特徴とする請求項3記載のドリルの切刃形成方法。
3. In a drill having a chip discharge groove and a margin portion formed on a shank, and a cutting edge formed at the tip to the outer peripheral end, the intersection of the cutting edge and the margin portion is ground to cut the cutting edge of the cutting edge. The rotation locus formed by the margin is 5 /
4. An inclined surface having a gradually increasing distance from the center axis of the drill is formed between the outer peripheral edge of the cutting edge and the margin portion so as to have a large diameter of 1000 to 200/1000 mm. A method for forming a cutting edge of a drill described.
JP4176986A 1992-07-03 1992-07-03 Drill and formation of cutting blade of drill Pending JPH0615512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4176986A JPH0615512A (en) 1992-07-03 1992-07-03 Drill and formation of cutting blade of drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4176986A JPH0615512A (en) 1992-07-03 1992-07-03 Drill and formation of cutting blade of drill

Publications (1)

Publication Number Publication Date
JPH0615512A true JPH0615512A (en) 1994-01-25

Family

ID=16023188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4176986A Pending JPH0615512A (en) 1992-07-03 1992-07-03 Drill and formation of cutting blade of drill

Country Status (1)

Country Link
JP (1) JPH0615512A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008059697A1 (en) * 2006-11-17 2008-05-22 Unitac, Incorporated Method for manufacture of through-hole
US20080166196A1 (en) * 2005-09-14 2008-07-10 Jiangsu Tiangong Tools Co., Ltd. Drill Bit with High Performance for Chip Removal
JP2014018883A (en) * 2012-07-13 2014-02-03 Hitachi Tool Engineering Ltd Drill and method for manufacturing drill bit part
JP2015142950A (en) * 2014-01-31 2015-08-06 旭ダイヤモンド工業株式会社 drill
US20180029140A1 (en) * 2014-09-23 2018-02-01 Iscar, Ltd. Drill or drill head with burnishing margin
US20180043441A1 (en) * 2015-03-30 2018-02-15 Mitsubishi Hitachi Tool Engineering, Ltd. Drill
JP7206573B1 (en) * 2022-06-15 2023-01-18 住友電工ハードメタル株式会社 Drill

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080166196A1 (en) * 2005-09-14 2008-07-10 Jiangsu Tiangong Tools Co., Ltd. Drill Bit with High Performance for Chip Removal
US8807887B2 (en) * 2005-09-14 2014-08-19 Jiangsu Tiangong Tools Co., Ltd. Drill bit with high performance for chip removal
WO2008059697A1 (en) * 2006-11-17 2008-05-22 Unitac, Incorporated Method for manufacture of through-hole
JP2008126340A (en) * 2006-11-17 2008-06-05 Yunitakku Kk Method for forming through-hole
JP2014018883A (en) * 2012-07-13 2014-02-03 Hitachi Tool Engineering Ltd Drill and method for manufacturing drill bit part
JP2015142950A (en) * 2014-01-31 2015-08-06 旭ダイヤモンド工業株式会社 drill
US20180029140A1 (en) * 2014-09-23 2018-02-01 Iscar, Ltd. Drill or drill head with burnishing margin
US10005136B2 (en) * 2014-09-23 2018-06-26 Iscar, Ltd. Drill or drill head with burnishing margin
US20180043441A1 (en) * 2015-03-30 2018-02-15 Mitsubishi Hitachi Tool Engineering, Ltd. Drill
US10279398B2 (en) * 2015-03-30 2019-05-07 Mitsubishi Hitachi Tool Engineering, Ltd. Drill
JP7206573B1 (en) * 2022-06-15 2023-01-18 住友電工ハードメタル株式会社 Drill
WO2023243005A1 (en) * 2022-06-15 2023-12-21 住友電工ハードメタル株式会社 Drill

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